Generic limits for several classes

I have a class called shape and 5 subclass called square, Triangle, circle, Rhombus and Rectangle. I want to do a generic class that is bounded. I want to type T to accept a square, Triangle, circle and their respective subtypes. I don't want T to be able to accept a diamond or a Rectangle.

How do I do that?

I tried this, but it doesn't seem to work properly.
public class GenericShapes < T extends square, Triangle, circle >

Published by: SquareBox on March 25, 2011 10:08

SquareBox wrote:

I know semi – you can do that. Is there a real reason why you would need that?

Suppose you need to process orders. You have called superclass for all products of the company. The company sells computer parts. You want to make a list of all parts of the computer that are sold. The company also makes the cheese. You want to make a list of all the objects of cheese that are sold. You do not want parts of computer in the list of cheese and you don't want cheese in the list of computer parts.

If this analogy is accurate, then there must be something on these 3 shapes that go together what they have in common that the other 2 do not share. In other words, they are examples of a certain type which are not the other 2. This is precisely the case for another interface - if marker or normal - that identifies this type. This interface may or may not extend to form, depending on whether it is a property of the 'form is', or something completely different. For example, if it is RotationalSymmetry90Degrees, it must extend the form. If it is StuffMyGrandmaLikes, it should not.

Then share what property these 3 forms that the other 2 are not?

You are new to the company, and the boss says you need to use these existing classes. You can't change them because it will screw everything up. It will tell you you need to do a generic class that excludes all types of monitors, devices, hard disks, ect... but without cheese. To make it more difficult that you are NOT authorized to create a superclass called ComputerParts. The boss wants to inherit everything from product. Product may be the only supertype in the program.

I'm not going to dig deep enough into the analogy to understand if you say that you can't create another interface for the forms 3 to implement. If it is in fact what you say, it is an artificial constraint, then I don't know what you're instructor is on everything he's trying to teach you, and what are the other artificial constraints may be present, so I'm out.

What would you do to fix this? In addition to tell your boss that he is a nut.

In the real world, tell him he's wrong. In artificial medium such as coursework, this would depend on a lot more details that I don't know and am not interested.

I tried several approaches. I want to just do something like this but T can range from diamond. I don't know how to write syntax for this. I'm sure it's possible

Why do you have to be sure that it is possible? Just because you want to be it?

Tags: Java

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